а) 1=3/3; 3/3-1/3 =(3-1)/3=2/3
б) 1=7/7; 7/7-2/7=(7-2)/7=5/7
в) 1=9/9; 9/9-5/9=(9-5)/9=4/9
г) 1=13/13; 13/13-8/13=(13-8)/13=5/13
д) 1=41/41; 41/41-5/41=(41-5)/41=36/41
е) 1=27/27; 27/27-13/27=(27-13)/27=14/27